A series of pH indicators were trapped in sol-gel porous glasses by polymerization of tetramethoxysilane in the presence of a surface active agent. The properties of these novel sensing materials including spectral shifts, shifts in the pH-sensing range, cycle repeatability, leachability, rates of response and isosbestic points are described. A prototype of a pH meter based on a pH-sensing glass was constructed.
Bibliographical noteFunding Information:
Supportedb y grants from the Israel National Council for R&D and KFK, Karlsruhe,G ermany; the US Army Research,D evelopmenta nd Stand-ardizationG roup (UK); theK rupp Foundationt; he SzaldF oundation.M O and DA are memberso f the L. Farkas (Minerva) Centerf or Light-EnergyC on-versiona nd acknowledgiets support.D A is a member of the F. Haber ResearchC enterf or Molecular Dynamics.